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I agree. I think they meant to say "American Style" (line 1), then "Sour Cream & Onion" (line 2). (These kinds of errors and gaffes in packaging are not all that uncommon, particularly overseas.) "American Flavour" is rather humorous, too, in an oxymoron kind of way.
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J.R.Jun 29 '12 at 17:58

I thought at first from the title that this was a misprint of Styling Cream, a variant of Styling Gel, but I don't think that would go well with onion, at least not on potato chips.
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John LawlerJun 29 '12 at 18:47

3

The OP is (according to his profile) in Italy. Italian cuisine doesn't use "sour cream" (panna acida) - see this question - so chips that are flavored with sour cream are definitely "American-style".
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MT_HeadJun 29 '12 at 19:04

The phrase is meant to be parsed as "(sour, by implication) cream and onion in the American style". Because the adjectival phrase "American style" is broken across two lines, miscapitalized, and does not have a hyphen in the adjectival phrase, the implication by layout is that "style", to use a programming term, binds more tightly than the full phrase, leading to the false conclusion that "style cream" is something that exists. This should have been laid out as

American-style
Cream and Onion
Flavour

to ensure that the phrase wasn't misinterpreted. Note the hyphen and lower-case "s" in style, which says "this is a single adjectival phrase, to be parsed as a unit".

American Style
Cream and Onion
Flavour

would have communicated the intended meaning, despite being ambiguously punctuated, because the layout implies the association of "American" and "Style" instead of "Style" and "Cream".

I'd guess this was the original layout, and someone tweaked the font size up, causing "Style" to move to the next line; the tweaker, not knowing the English rules for adjectival phrases, decided to move "style" to the second line because it was "looked nicer" (one word on top, one on the bottom). The little "new" flag was probably also an unconscious impetus to break the line after "American", as it crowds the first line a little.